前 K 个高频元素问题 作者:Grey 原文地址: 前 K 个高频元素问题 题目描述 LeetCode 347. Top K Frequent Elements 思路 第一步,针对数组元素封装一个数据结构 public class Node { int v; int t; public Node(int value, int times) { v = value; t = times; } } 其中v表示数组元素,t表示数组元素出现的次数. 第二步,使用哈希表把每个元素的词频先存一下.其中key
Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth smallest element in the sorted order, not the kth distinct element. Example: matrix = [ [ 1, 5
Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Follow up: What if the BST is modified (insert/delete operations) often and you nee
利用快排思想,如果标志位大于k,则第k小的数字在左边,否则在右边.(程序是第k大的元素) #include <iostream> #include <vector> using namespace std; //求向量中第k大的数字,从大到小进行排列 int q_sort(vector<int> &v, int low, int high) { int tmp = v[low]; while (low < high) { while (low<hig
Given a non-empty array of integers, return the k most frequent elements. Example 1: Input: nums = [1,1,1,2,2,3], k = 2 Output: [1,2] Example 2: Input: nums = [1], k = 1 Output: [1] Note: You may assume k is always valid, 1 ≤ k ≤ number of unique ele
Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth smallest element in the sorted order, not the kth distinct element. Example: matrix = [ [ 1, 5
Design a class to find the kth largest element in a stream. Note that it is the kth largest element in the sorted order, not the kth distinct element. Your KthLargest class will have a constructor which accepts an integer k and an integer array nums,
